/*
 * Copyright (C) 2010 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.lib_qrcode.zxing.camera;

import android.graphics.Point;
import android.hardware.Camera;
import android.os.Handler;
import android.os.Message;
import android.util.Log;

final class PreviewCallback implements Camera.PreviewCallback
{
	private static final String TAG = PreviewCallback.class.getSimpleName();

	private final CameraConfigurationManager configManager;
	private final boolean useOneShotPreviewCallback;
	private Handler previewHandler;
	private int previewMessage;

	PreviewCallback(CameraConfigurationManager configManager, boolean useOneShotPreviewCallback)
	{
		this.configManager = configManager;
		this.useOneShotPreviewCallback = useOneShotPreviewCallback;
	}

	void setHandler(Handler previewHandler, int previewMessage)
	{
		this.previewHandler = previewHandler;
		this.previewMessage = previewMessage;
	}

	public void onPreviewFrame(byte[] data, Camera camera)
	{
		Point cameraResolution = configManager.getCameraResolution();
		if (!useOneShotPreviewCallback)
		{
			camera.setPreviewCallback(null);
		}
		if (previewHandler != null)
		{
			Message message = previewHandler
					.obtainMessage(previewMessage, cameraResolution.x, cameraResolution.y, data);
			message.sendToTarget();
			previewHandler = null;
		}
		else
		{
			Log.d(TAG, "Got preview callback, but no handler for it");
		}
	}

}
